Filter.



E. ZAHM. Y

FILTER.

APPLICATION FILED Nov. 22 I I9I2. BENI-:WED MAR. 1.1915.

Patented Sept. 14, 1915.

2 SHEETS-SHEE 2.

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tlNlltl NAT@ @TENT Flfill.

EDWARD ZAI-IIVI, OF BUFFALO, NEW YORK, ASSIG-NOR TO ZAI-IlVI MANUFACTURING COMPANY, OF BUFFALO, NEW YORK, A CORPORATION OF NEW YORK.

FILTER.

tisanes.

Specification of Letters Patent. i Pgttmitd Sept. li, 1915.

Application l'ed November 22, 1912, Serial No. 732,923. Renewed March 1,1915. Serial: No. 11,323.V

To all 'whom 'it may concern Be it known that l, EDWARD ZAHM, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Filters, of which the following is a specification.

This invention relates to that class of lters in which the filtering area is produced by means of a plurality of porous tubes which are so mounted on a partition ar ranged between a liquid inlet chamber and a liquid outlet chamber that the unfiltered liquid upon passing from the supply chamber to the delivery chamber is compelled to pass through each of the filter tubes from the outer side to the inner side thereof and thereby separate any solid impurities contained in the liquid and leave these impurities deposited on the outer side of the tube where the same can be brushed 01T or otlire means heretofore employed for mounting these filter tubes on the partition between the inlet or supply andthe outlet or delivery chambers were so constructed that a strain was produced upon the joint between the filter tube and its nozzle which strain was Aliable to loosen the joint between the same and permit unfiltered liquid to reach the body of filtered liquidV so that the latter was contaminated and its quality impaired.

It is the object of this invention to provide a mounting for filter tubes of this character whereby the same may be secured to the partition between the liquid supply and delivery chambers in such manner that a perfectly tight joint is produced between the filter tube and the nozzle and between the nozzle and said partition without liability of loosening the connection between the filter tube and the nozzle so that leakage of unfiltered liquid into the body of filtered liquid is positively prevented.

In the accompanying drawings consisting of 2 sheets, Figure l is a vertical longitudinal section of a filter having its filter tubes mounted on the partition between the liquid supply and delivery chambers by mountings constructed in accordance with my invention. Fig. 2 is a fragmentary vertical longitudinal section,

on an enlarged scale, showingone ofthe i.

filter tubes mounted on the partitionby means of my` improved connection. Fig. 3 is a vertical transverse section taken in line 3 3, ing. 2.

Similar characters of reference indicate corresponding parts throughout the several views.

Although the general construction of the filter which embodies my invention `may be ,widely varied the same is preferably, though not necessarily, embodied in a filter like that shown in Fig. l which comprises an inlet or supply chamber l for the unfiltered liquid, an outlet or delivery chamber 2 for the filtered liquid which is separated from the i.

6 represents a plurality of filter-membersy each of which is preferably constructed of porous filtering material in the-form of a cylinder which is closed at one end while its opposite end is open. The partition is` pro-V vided with a plurality of openings 7 extending through the same from the inlet chamber to the outlet chamber and each of these openings receives one of the means whereby one of the filter tubes is mounted upon the.

partition so that the interior of this tube communicates with the outlet chamber.

. My improved means for mounting each filter tube on the partition comprises a tubuA lar nozzle which is preferably constructed of metal so as to form an enlarged circular or cylindrical front head S at its inner end, a reduced circular or cylindrical neck 9 at its outer end, and a circular or cylindrical breast 10 of medium size on its central part forming an inner' annular shoulder 1l between the inner end of the breast and the outer end'of the head, and an annular outer an internal screfwthread 14 formed in the bore of the filter tube adjacent to the open end thereof. The latter is preferably strengthened at its open end by surroundy ingthis part thereof containing the head of the nozzle by-means of a ferrule 15 of metal which may be" secured to the filter tube by cement or. otherwise. Y Y

l'Iniorder to prevent leakage through the joint' between' the head 'of the nozzle and thelfltertub'e this joint is sealed by :means of a packing or ring 16 of rubber. or similar materialjsurrounding the inner part of the breastjof the nozzle and extending radially therefrom 'beyond the annular joint between the peripheryof'the nozzle head and the bore of the filter tube, and a clamping screw nut 17 arranged on a screw thread formed on the exterior of the breast and bearing by means of an interposed washer 18 against the outer side ofthe packing ring 16 so that the latter is pressed against the outer end or shoulder of the nozzle head and the outer end of the filter tube. By this means the jointbetween the nozzle head and the filter tube is, effectually sealed and leakage of any unfiltered liquid through this oint from the exterior of the tube to the interior thereof isfprevented and contamination of the filtered liquid isavoided.

.The neck Vvof each nozzle is arranged within one Vof the openings of the partition and thesame is secured therein so as to produce Y 'a tightjoint between the nozzle and partition,fthi's being preferably effected by means ofa packing or ring 19 constructed of a ring of rubber or other suitable material surrounding the inner ,end of the nozzle neck andI bearing with one of its radial sides against the outer shoulder 12 of the breast and lwith its otherradial side against the adjacent side o f the partition, and a clamping screw nut 20 engaging with an external screw thread formed on the neck of the nozzle and bearing by means of an interposed''washer 21 against the other side of thefpartition. Upon tightening this last mentioned screw nut lthe rubber packing 19 be drawn against the partition sufficiently firm tovprodfucea,r perfectly tight ,l-QIIL between thevnozzle and thepartition andy thereby` prevent anyleakage through this joint from the inlet chamber tothe outfetehamberi of the after.

'puring the operationi of filtering the liquid the; same passes from theinlet chamjoint between the.

ber through the several filter tubes from the outer side to the inner side thereof and then through the nozzles thereof into the outlet chamber. Any comparatively solid impurities contained in the liquid are separated therefrom as the liquid passes through the filter tubes and these solids collect on the outer side or periphery of the filter tubes. For the purpose of thoroughly clean- -ing these filter tubes the same are removed from the partition and the peripheries thereof are thoroughly brushed for removing the accumulated impurities therefrom after which the tubes are again secured to the partition between the inlet and outlet chambers.

Heretofore the pressure applied to the nozzle of the filter tube for securing the same in the partition was in part transmitted to the filter tube itself which was objectionable because of the liability of loosening the joint between the filter tube, and the nozzle. In the present construction the tightening of the screw nut for securing the nozzle to the partition of the filter in no wise affects the joint between the nozzle and the filter tube inasmuch' asr the packing between the nozzle and the filter tube isentirely separate and distinct from the means whereby the nozzle is clampedon the partition. By this means it is impossible forthe operator while fitting the filter nozzle on the partition to produce ay leaky joint Ybetween the filter tube and the nozzle and no particular care need therefore be required on the part of the operator to avoid excess pressure on the nozzle when clamping the same on the partition as has been necessary heretofore. The nozzlesy can therefore be secured much more tightly inthe partition than has been possible heretofore and also much quicker, inasmuch as no particular care need be taken to avoid excessive pressure, thereby enabling the operation of cleaning of the filter to beefiected more eX- peditiously and economically.

I claim 'as my invention:

A filter comprising a partition or a dia phragm having an opening,- a filter ltube arranged on one side of said partition, a nozy der of the nozzle and extending across the 4 y head; and filter tube, a clampingnscrew nutengaging with a thread on the periphery of said Ybreast and'bearing against the outer side of said large packing Witness my hand this 20th day of Novemring, a small packing ring engaging the small ber. 1912.

shoulder of the nozzle and bearing against the adjacent side of the partition, and a EDWARD ZAHM' A clamping screw nut engaging With a thread Witnesses:

on the periphery of said neck and bearing THEO. L. Por?,

against the opposite side of said partition. ANNA HEIGIS.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

